|Publication number||US7292946 B2|
|Application number||US 10/819,246|
|Publication date||Nov 6, 2007|
|Filing date||Apr 6, 2004|
|Priority date||Aug 5, 1999|
|Also published as||US6718274, US20020111771, US20040204898|
|Publication number||10819246, 819246, US 7292946 B2, US 7292946B2, US-B2-7292946, US7292946 B2, US7292946B2|
|Inventors||Yishao Max Huang, Sterling D. Du|
|Original Assignee||O2Micro International Limited|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (27), Non-Patent Citations (1), Referenced by (6), Classifications (15), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation application under 37 CFR §1.53(b) of application Ser. No. 10/047,419 filed Jan. 15, 2002, now U.S. Pat. No. 6,718,274, which is a Continuation In Part application of U.S. patent application Ser. No. 09/536,578 filed Mar. 28, 2000, now U.S. Pat. No. 6,470,284 which in turn claims benefit of U.S. Provisional Patent Applications Ser. No's. 60/147,544, filed on Aug. 5, 1999; 60/161,249, filed on Oct. 25, 1999; and 60/174,948 filed on Jan. 7, 2000, the teachings of which are hereby incorporated by reference.
The present invention relates to an integrated controller for the detecting and operating one or more expansion cards. More specifically, the present invention relates to an integrated controller for detecting and controlling PC Cards (16-bit PCMCIA cards and 32 bit-CardBus cards), smart cards, and flash media cards. Particular utility of the present invention is to provide an integrated controller for mobile computing devices, e.g., laptop computers, etc, although other utilities are contemplated herein.
The need for security and enhanced privacy is increasing as electronic forms of identification replace face-to-face and paper-based ones. The emergence of the global Internet, and the expansion of the corporate network to include access by customers and suppliers from outside the firewall, have accelerated the demand for solutions based on public-key technology. A few examples of the kinds of services that public key technologies enable are secure channel communications over a public network, digital signatures to ensure image integrity and confidentiality, and authentication of a client to a server (and visa-versa).
Smart cards are a key component of the public-key infrastructure that Microsoft is integrating into the Windows platform because smart cards enhance software-only solutions such as client authentication, logon, and secure e-mail. Smart cards are essentially a convergence point for public key certificates and associated keys because they provide tamper-resistant storage for protecting private keys and other forms of personal information; isolate security-critical computations involving authentication, digital signatures, and key exchange from other parts of the system that do not have a “need to know”; and enable portability of credentials and other private information between computers at work, home, or on the road.
It is estimated that the smart card will become an integral part of the Windows platform because smart cards will enable new breeds of applications in the same manner that the mouse and CD-ROM did when they were first integrated with the Personal Computer (PC). Incompatibility among applications, cards, and readers has been a major reason for the slow adoption of smart cards outside of Europe. Interoperability among different vendors' products is a necessary requirement to enable broad consumer acceptance of smart cards, and for corporations to deploy smart cards for use within the enterprise.
ISO 7816, EMV, and GSM
In order to promote interoperability among smart cards and readers, the International Standards Organization (ISO) developed the ISO 7816 standards for integrated circuit cards with contacts. These specifications focused on interoperability at the physical, electrical, and data-link protocol levels. In 1996, Europay, MasterCard, and VISA (EMV) defined an industry-specific smart card specification that adopted the ISO 7816 standards and defined some additional data types and encoding rules for use by the financial services industry. The European telecommunications industry also embraced the ISO 7816 standards for their Global System for Mobile communications (GSM) smart card specification to enable identification and authentication of mobile phone users.
While all of these specifications (ISO 7816, EMV, and GSM) were a step in the right direction, each was either too low-level or application-specific to gain broad industry support. Application interoperability issues such as device-independent APIs, developer tools, and resource sharing were not addressed by any of these specifications.
The PC/SC (Personal Computer/Smart Card) Workgroup was formed in May 1996 in partnership with major PC and smart card companies: Groupe Bull, Hewlett-Packard, Microsoft, Schlumberger, and Siemens Nixdorf. The main focus of the workgroup has been to develop specifications that solve the previously mentioned interoperability problems. The PC/SC specifications are based on the ISO 7816 standards and are compatible with both the EMV and GSM industry-specific specifications. By virtue of the companies involved in the PC/SC Workgroup, there is broad industry support for the specifications and a strong desire to move them onto an independent-standards tract in the future.
Since its founding and initial publication of the specifications, additional members have joined the PC/SC Workgroup. New members include Gemplus, IBM, Sun Microsystems, Toshiba, and Verifone.
Microsoft's Approach Consists of the Following:
Having a standard model for how readers and cards interface with the PC enforces interoperability among cards and readers from different manufacturers. Device-independent APIs serves to insulate application developers from differences between current and future implementations. Device-independence also preserves software development costs by avoiding application obsolescence due to underlying hardware changes.
The most popular method currently being used to interface a smart card with a notebook computer is to use a PCMCIA Type II smart card reader/writer (
Thus, there exists a need to provide an integrated host controller that provides PC Card, smart card, and Passive smart card adapter operability. Moreover, there exists a need to provide an integrated controller that can replace existing motherboard-mounted PC Card host controllers, without having to retool or redesign the motherboard.
A controller consistent with the present invention includes a plurality of readers for reading an associated plurality of expansion cards and for controlling operation of the associated plurality of expansion cards, wherein at least one of the plurality of readers is a flash media reader. The controller may also include at least one smart card reader and at least one PC card reader. The controller may also include a plurality of flash media readers and be further configured to be responsive to an input signal indicative of one selected flash media reader from among the plurality of flash media readers to enable one selected flash media reader. A personal computer (PC) configured to accept digital information from at least one expansion card may also include a controller consistent with the present invention.
A method consistent with the present invention for controlling the operation of at least one expansion card with an integrated controller having a plurality of readers includes: detecting the presence of at least one expansion card; and enabling a selected reader of the integrated controller associated with said at least one expansion card. The detecting step may further include detecting the presence of an expansion card using conventional PC Card specification signal lines including: determining the signal state of a first and second card detection signal line; determining the signal state of a first and second voltage select signal line; determining if the first and/or second card detection signal line, or said first and/or second voltage select signal line, comprise a signal state that is reserved by a PC Card signal specification; and determining the signal state of a predetermined unused PC Card signal line, relative to said reserved signal state.
Another method of writing data to read only memory in an integrated controller consistent with the present invention includes: unlocking the read only memory; writing information into the read only memory; and locking the read only memory to prevent otherwise unintentional or unauthorized writing to the read only memory.
It will be appreciated by those skilled in the art that although the following Detailed Description will proceed with reference being made to preferred embodiments and methods of use, the present invention is not intended to be limited to these preferred embodiments and methods of use. Rather, the present invention is of broad scope and is intended to be limited as only set forth in the accompanying claims.
Other features and advantages of the present invention will become apparent as the following Detailed Description proceeds, and upon reference to the Drawings, wherein like numerals depict like parts, and wherein:
In one embodiment, the present invention provides a passive smartcard adapter 18 which is configured to be inserted into either Socket A 12 or Socket B 14, which are in turn configured as either PC Card type I/II/III—type socket interface. The passive adapter 18 of this embodiment includes appropriate connector 84 and passive circuit 86. The smart card 16 inserted into the passive smart card adapter 18 also includes physical contacts 88 to interface with the physical connector 84 of the adapter. Pinout arrangements 84 and 88 of the adapter and smart card are dictated by the smart card specification, for example PC/SC compliant Smart card specification that meets ISO 7816 electrical specifications and T=0, T=1 protocols. In this embodiment the use of an adapter 18 permits smart card readability and operability without retooling the PC case to include a specific smart card socket. Alternatively, the PC can include a smart card slot 14′ as shown in
Referring now to
It should be noted at the outset that
Thus, in one sense, the smart card sensing logic 30A shown in
The smart card sensing logic 30A and 30B operate to detect both a smart card or a passive smart card adapter and PC Cards, based on the Table in
A flow chart 60 of the card-type detection process is depicted in
Another feature of the present invention is to provide an integrated controller circuit 10, which can be directly integrated with current PC Card controller logic. Conventional PC Card controller logic is an IC package that is mounted directly on the motherboard, which has 208 pins, and each of these pins is assigned by the PC Card specification. Another feature is to provide a controller 10 that can directly replace conventional controllers, without having to reconfigure pin assignments, add additional pin configurations, alter the motherboard, or change the tooling required. To that end, and referring to the table of
To facilitate direct integration with conventional PC Card logic sets, the present invention controls a predetermined number of pre-assigned pins to effectuate smart card communication. For example, as shown in
The table and
Those skilled in the art will recognize that CD1, CD2, VS1 and VS2 comprise card detect and voltage select signals, respectively, as specified by the conventional PC Card signal specification. In the tables of
Thus, it is evident that there has been provided an integrated Smart card controller and Smart card detection process that satisfies the aims and objectives stated herein. It will be apparent to those skilled in the art that modifications are possible. For example, although the present invention has been described with reference to detection and operation of smart Cards, the present invention is equally adapted for the detection and operation of any type of expansion cards, in addition to conventional PC Cards. Other modifications are possible. For example, it may be desirable to include a software lock on the operability of the smart card logic shown herein. Accordingly, the logic depicted in
As earlier indicated, the present invention, although first described with reference to detection and operation of smart cards and PC cards, is equally adapted for the detection and operation of a variety of expansion cards. For instance, in another embodiment consistent with the present invention a controller 10A may also be adapted detect and operate one or a plurality of flash media cards.
Flash media cards may be used with various “digital appliances” and have a variety of different shapes, capabilities, and storage capacities. For example, a digital video camcorder, a digital camera, portable music player, personal digital assistant (PDA), or the like are examples of some “digital appliances” that store digital information on various flash media cards. Some types of flash media cards include SmartMedia™, CompactFlash™, and Memory StickŪ cards. In order to transfer such stored digital information to and from a PC, various flash media readers need to be utilized.
Like the smart card example previously described with reference to
Advantageously, as illustrated in
The controller 10A may be responsive to an input signal delivered to the controller 10A via an input path 803. The input signal may be indicative of a particular expansion card, and the controller may further act based upon the input signal to enable and/or disable various flash media readers 804-1, 804-2, . . . 804-n as later more fully described.
The controller 10A may also permit a selected reader to be chosen from the plurality of flash media readers 804-1, 804-2, . . . 804-n for individual testing. For example, a separate test signal may be coupled via a test path 807 to the input path 803 indicating which selected reader is to be tested. In this case, the subject reader may be enabled for testing purposes.
In addition, as space and other considerations permit, the controller 10A may also be coupled to a plurality of sockets, which are further coupled to the motherboard of an associated PC. Three exemplary sockets 806-1, 806-2, 806-3 are illustrated in
In addition, another socket 806-3 may be a standard PC card type I/II/III interface. Such interfaces may accept a passive adapter 811 that may further accept a variety of expansion cards 808-3. As previously detailed, such an adapter 811 may include a smart card socket to accept a smart card. Other types of passive adapters 811 may fit into the same PC Card interfaces and accept flash media cards, e.g., a Memory StickŪ adapter may accept a Memory StickŪ card and connect to a standard PC Card type interface.
A controller 10A consistent with the present invention may also be configured to enable a selected reader and disable other readers. Advantageously, this permits power savings and simplifies operation of the integrated controller 10A. In addition, it also permits selected readers to be individually tested as earlier detailed.
In order to enable a specific flash media reader, a SEEPROM external to the integrated controller 10 may be utilized. The SEEPROM may load data information to the read only configuration registers when the system power is turned on. This data information may include a variety of different information such as PC manufacturer information and system configuration instructions including information indicating which reader should be enabled, and which readers should be disabled.
A preferable method of enabling a specific flash media reader may be to include software to program configuration registers 908 in the integrated controller 10A based on the input signal delivered over the input path 803. To accomplish this, the read only registers 908, in particular the “socket-on-demand” registers, may be programmed with values that would otherwise be stored in the external SEEPROM. Programming the registers may take place during a certain state, e.g., a “power-on” reset state, or may take place at some other time as described further below.
Turning, for example to
Subsequently, a lock function may be enabled 1008 to prevent subsequent writing, otherwise unintentional or unauthorized, into the registers. A lock function may be a predetermined one-lock bit, a predetermined read/write lock sequence, or a predetermined data lock pattern. Thereafter, the “socket-on-demand” registers become “read-only” registers 1010.
After the unlock function is enabled, software consistent with the present invention writes data into the registers in the next step 1106. For example, a three-bit data sequence could be utilized to provide instructions to the controller on enabling or disabling certain flash media readers. A “000” sequence may disable all flash readers, while a “001” sequence may enable a particular flash media reader. The flash media reader may be enabled in response to a test signal or in response to detection of a particular flash media card in a particular socket. Then, similar to the earlier described process, a lock function is enabled 1108 to prevent unwanted writing into the registers. Therefore, the “socket-on-demand” registers become “read-only” registers 1110.
The embodiments that have been described herein, however, are but some of the several which utilize this invention and are set forth here by way of illustration but not of limitation. It is obvious that many other embodiments, which will be readily apparent to those skilled in the art, may be made without departing materially from the spirit and scope of the invention.
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|U.S. Classification||702/64, 710/13, 702/65, 710/301|
|International Classification||G06F3/08, G06K17/00, G01R25/00, G06F13/40, G06F3/00, G01R19/00, G06F13/00|
|Cooperative Classification||G06F13/4081, Y02B60/1228, Y02B60/1235|
|May 6, 2011||FPAY||Fee payment|
Year of fee payment: 4
|Oct 17, 2012||AS||Assignment|
Owner name: MAISHI ELECTRONIC (SHANGHAI) LTD., CHINA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:O2MICRO INTERNATIONAL LIMITED;REEL/FRAME:029147/0473
Effective date: 20121012
|Jun 19, 2015||REMI||Maintenance fee reminder mailed|
|Nov 6, 2015||LAPS||Lapse for failure to pay maintenance fees|
|Dec 29, 2015||FP||Expired due to failure to pay maintenance fee|
Effective date: 20151106